One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,10,12)(7,8,9,11)(13,14)(15,20)(16,18)(17,19)(22,23)(24,28)(1,2)(3,4)(5,7,10,9)(6,11,12,8)(13,15)(14,16)(17,18)(19,20)(21,22,25,23)(24,26,28,27)(1,2,3,4)(6,12)(7,9)(15,18)(16,20)(21,22,25,23)(24,27,28,26)(5,8)(6,7)(9,12)(10,11)(13,14)(15,20)(16,18)(17,19)(21,23,25,22)(24,27,28,26)(1,2)(3,4)(5,9,10,7)(6,8,12,11)(13,16,17,20)(14,18,19,15)(21,24)(22,26)(23,27)(25,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.